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Women ages 19 to 50 require 18 mg of iron daily, while men in this age range only need 8 mg. During pregnancy, this need rises to 27 mg daily. ... calcium, folate and vitamin C, which boosts iron ...
Iron absorption from diet is enhanced in the presence of vitamin C and diminished by excess calcium, zinc, or manganese. [ 14 ] The human body's rate of iron absorption appears to respond to a variety of interdependent factors, including total iron stores, the extent to which the bone marrow is producing new red blood cells, the concentration ...
Increased erythrocyte synthesis also stimulates iron absorption in the gut. [15] Therefore, oral bioavailability of iron varies greatly, ranging from less than 1% to greater than 50%. [16] Uptake of iron can be enhanced by dietary heme iron and vitamin C, while inhibited by calcium, polyphenols, tannins and phytates. [13]
The same can occur with elements in food, such as calcium, which impacts both heme and non-heme iron absorption. [39] Absorption of iron is better at a low pH (i.e. an acidic environment), and absorption is decreased if there is a simultaneous intake of antacids. Many other substances decrease the rate of non-heme iron absorption.
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Iron is primarily absorbed in the small intestine, in particular the duodenum and jejunum. Certain factors increase or decrease absorption of iron. For example, taking Vitamin C with a source of iron is known to increase absorption. Some medications such as tetracyclines and antacids can decrease absorption of iron. [14]
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